Plotting scale



2v Sheets-Sheet l.4

(No Model.)`

Patented July 28Q1885..

F. E. SHAW.

PLOTTING SCALE.

2 ASheets--Sheet 2.

-(No Model.)

PLOTTING SCALE.

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NITED lSTATES PATENT einen.

FREDERICK E. SHAW, OF VALLEY FALLS, RHODE ISLAND.

PLOTTING-SCALE.

SPECIFICATION forming part of Letters Patent NO. 323,218, dated July 28, 1885.

Appncanon mea Maren 3, 1885. (No model.)

To all whom it may concern:

Be it known that I, FREDERICK E. SHAW, of Valley Falls, in the county of Providence and State of Rhode Island, have invented a new and useful Improvement in Plotting- Scales, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to an instrument which is designed to be used in ordinary practice in p engineers and architects offices, and also to an attachment therefor by means of which, when combined with the former, the layingoff angles, the plotting of profiles, the construction of elevations, and general co-ordinate work may be greatly facilitated.

To the above purposes my invention consists in certain peculiar and novel features of construction and arrangement, as hereinafter described and claimed.

In order that myinvention may be fully undei-stood, I will proceed to describe it with reference to the accompanying drawings, in which Figure lis a plan view of my improved plotting-scale. Fig. 2 is a sectional view of the same on line 2 2 ofFig. 1. Fig. 3 isasimilar view of the same on line 3 3 of Fig. l. Fig. 4 is a similar view of the saine on line 4 4t of Fig. 1. Fig. 5 is an edge view of the same. Fig. 6 is a plan view of a complete plotting apparatus constructed in accordance with my invention. Fig. 7 is a sectional view of the same on line 7 7 of Fig. 6.

In the said drawings, A designates the measuring ruler or scale,which contains the usual series of scales employed in this class of work. This ruler is held removably in a frame, B, into one end of which the ruler is pushed, and at the opposite end of which said ruler or scale is secured by a binding-screw, a, which works through the end of the rule and into the frame B.

b designates astraight-edge, which is formed` upon or suitably secured to one edge of frame B.

C designates a saddle, which works longitudinally upon frame B, and the ends of which engage beneath guiding-surfaces on the edges of said frame, as shown at b b, Fig. 4. This saddle is formed at one end with an enlargement, c, through the opposite ends of which extend pricking-pins c.

c3 designates a spring-arm extending overruler or scale A from enlargement c, andtend- 5 5 ing to press downward toward said ruler.

D designates a slide, which extends across saddle C, and the ends d of which are bent downward toward ruler or scale A. This slide is also provided witha boss, d', through which 6o the spring c3 passes, and by which the movements of the slide are guided.

On the under side of guide D are formed two teats, di, which are held in holes upon the saddle C by the downward pressure of Spring c.

In Figs. 6 and 7 E designates a base-frame carrying a rule, e, and having a longitudinal slot, e. The ends of this frame are turned upward, as shown at e?, and a wire, e, extends 7o from one end el to t-he other.

F designates a triangle, which is of metal, and the edge of one limb of which is bent so as to enter theslot e', while at one angle said triangle is extended to form the indicator f.

The scale A B C D, die., is secured pivotally at one end to the base of triangle F, as shown at p, and at the opposite end said scale is secured adj ustably to the triangle by a connection, p', operated by a thumb-nut, p2, attached @8o to the triangle, so that by operating the nut any variation in the position of the scale may be remedied.

The rulers A and e are perfectly protected from wear either by contact with the prickwire-e3 crosses underneath knife-edge b, the 9o index f serving to indicate the position of the scale A.

In plotting-scales the divisions of measurement are indicated in two series, one on each side of the ruler; hence the ruler A may be readily drawn out of frame B and inserted in reversed position, when required. The wire e3 extends across the scale and triangle next to the paper upon which the plat is being drawn.

To lay off any certain distance upon any desired scale, the spring c3 is iirst raised from IOO - measure, and the straight-edge b is brought to the proper direction. The saddle, with its attachments, is now moved along the frame B till one of the reading edges indicates the proper reading on the ruler or scale A. By pressing the button o', which is nearer the reading-edge which has been used, the desired distance is accurately transferred to the paper.

In order to use the scales A, B, C, and D in connection with the attachment E and F, the pin p is fitted in the hole provided in the ruler or scale A, and the pin p is placed in a similar hole on the opposite end of scale A; The downturned edge ofthe triangleis placed in the slots e of the bar E, and the straightedge b is brought into exact perpendicularity to the wire e by means of the adjusting-screw 11". The Wire e3 is now placed on the zero, the center or starting-point, and horizontal distances may be read off from the ruler @by sliding the parts A B C D F along until the` indicator f shall have reached the proper position.

Vertical distances are read on the vertical ruler, and are registered by the prickingpoints c. It is only necessary to place point f at zero of scale e and crossed point of the Wire es-near end of frame E-on the center of the angle, with wire e in line with one side of the angle, and read oft' the values of the tangent on the vertical ruler, in order to lay off' any given angle.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. An improved plotting-scale consisting of a protecting-frame, B, having a. scale or ruler, A, mounted therein, a slotted base, E, carrying a ruler, e, and a triangle, F, arranged to move in the slot and adjustably connected to the frame B, substantially as described.

2. The combination of ruler VA, frame B, saddle C, and slide D, as specified.

3. The combination, with the base E, carrying ascale, e, and having slot e and wire e, of the triangle F, having index f and adjusting- 'screw p2, and the scale A B C D, as set forth.

4. The combination, with the scale A B C D and the triangle F, of the base E, having rule e, slot e, extensions e", and wire e, as specified.

FREDERICK E. SHAW.

Witnesses:

M. F. BLIGH, J. A. MILLER, J r. 

